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CVE-2021-27291

Good to know:

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Date: March 17, 2021

In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.

Language: Python

Severity Score

Related Resources (19)

https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14
https://github.com/pygments/pygments
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html
https://github.com/pypa/advisory-database/tree/main/vulns/pygments/PYSEC-2021-141.yaml
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/
https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html
https://nvd.nist.gov/vuln/detail/CVE-2021-27291
https://github.com/advisories/GHSA-pq64-v7f5-gqh8
https://access.redhat.com/security/cve/CVE-2021-27291
https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/
https://www.debian.org/security/2021/dsa-4878
https://www.debian.org/security/2021/dsa-4889
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55
https://www.mend.io/vulnerability-database/CVE-2021-27291

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption ('Resource Exhaustion')

CWE-400

Inefficient Regular Expression Complexity

CWE-1333

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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